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Direct-current insulation monitoring device

A monitoring device, DC insulation technology, applied in the direction of measuring device, measuring electricity, impedance measurement, etc., can solve the problems of refusal failure, power grid accident, endangering the safe and stable operation of the power system, etc., and achieve the effect of preventing self-failure

Active Publication Date: 2015-04-22
STATE GRID CORP OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors will not only cause malfunction and refusal of relay protection devices, but also cause accidents on the primary side of the power grid, endangering the safe and stable operation of the power system.

Method used

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] A DC insulation monitoring device, the device includes a balanced bridge circuit and an unbalanced bridge circuit, the monitoring device also includes an intelligent adjustment circuit and a leakage current sensor, the intelligent adjustment circuit includes a controlled current source and a switch device, the switch device is used for The controlled current source is connected between the positive busbar and the ground or between the negative busbar and the ground; the leakage current sensor is connected in series with a detection switch and connected in parallel at both ends of the controlled current source.

[0017] Based on the above technical solutions and in conjunction with the accompanying drawings, the following specific implementation is given.

[0018] The present invention comprises following several parts:

[0019] Balanced bridge circuit...

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Abstract

The invention relates to a direct-current insulation monitoring device. The device comprises a balance bridge circuit and an unbalanced bridge circuit. The monitoring device further comprises an intelligent adjusting circuit and a current leakage sensor. The intelligent adjusting circuit comprises a controlled current source and a switching device used for connecting the controlled current source between a positive bus-bar and the ground or between a negative bus-bar and the ground. The current leakage sensor is connected with a detection switch in series and then connected to the controlled current source in parallel. The controlled current source in the intelligent adjusting circuit can simulate unbalanced failures, and when the unbalanced failures occur, the current leakage sensor will detect current leakage and then calculate resistance, to the ground, of the positive bus-bar and the negative bus-bar. By the adoption of the monitoring device, the failures can be simulated and detected, and therefore failures of equipment can be prevented.

Description

technical field [0001] The invention relates to a direct current insulation monitoring device. Background technique [0002] With the development of smart grid, unattended substation is a big development trend. For this DC system, the requirements for its intelligence and reliability are also constantly increasing, and the reliability and safety of the DC power system directly affect the reliability and safety of the power system power supply. like figure 1 The main factors that endanger the reliability and safe operation of the DC system are: the ground fault of the DC system, the distributed capacitance of the DC bus to the ground (C+, C-, CJ) and Instantaneous fluctuations of DC bus voltage to ground, AC series faults, DC mutual series faults, etc. These factors will not only cause malfunction and refusal of relay protection devices, but also cause accidents on the primary side of the power grid, endangering the safe and stable operation of the power system. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/18
Inventor 王永锋周登勇于海斌丁圆王佰超裴国强
Owner STATE GRID CORP OF CHINA
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